When Megatron was resurrected and attacked Sam; the Autobots came to his rescue. When Prime barged in I don't seem to recall him even being remotely surprised to the fact that his old nemesis was up and about.
Did that seem odd to anyone else?

Sam's life was in danger. Prime's top priority was to get him out of Megatron's reach. I'm sure he was slightly stunned to see Megatron alive even if he was expecting it, but that probably didn't matter to him as much as Sam's life did. Optimus probably came prepared for the worst.

I'd like to have heard a few lines from Megatron though.

"Optimus... How nice of you to show up... So predictable. The boy led me right to you, and I didn't even have to go out hunting"

Maybe he had a moment of DULL SURPRISE offscreen or something. Sides, he probably was too busy regretting leaving Megatron's head intact when he was thrown into the ocean. After all, it seems anymone whose face was destroyed has yet to come back.

Seriously, I'm starting to think Bay's Transformers are zombies or something. Stab them near their spark chamber, they're still walking and screaming. Melt their face, they fall to the ground.

When Megatron was resurrected and attacked Sam; the Autobots came to his rescue. When Prime barged in I don't seem to recall him even being remotely surprised to the fact that his old nemesis was up and about.
Did that seem odd to anyone else?

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WAIT WHAT ???????????

We were told we got the mouth sans plate on prime so he could emote for just that reason and Bay didnt do it.

Shocker

Michael Bay doesnt have feelings so neither do his movies. I m sure to him it seemed completely ok that Prime was just like hey wassup megatron.

Please take you ticket stub and go to the end of the line your Plot Hole will be addressed in the order it was recieved.

Does it matter? If my own brother was trying to kill me for centuries, and I finally saw him dead, then he comes back to life, and I dont know about it, Im not gonna say anything, Im just gonna shoot and beat the shit out of him!

Sam's life was in danger. Prime's top priority was to get him out of Megatron's reach. I'm sure he was slightly stunned to see Megatron alive even if he was expecting it, but that probably didn't matter to him as much as Sam's life did. Optimus probably came prepared for the worst.

I'd like to have heard a few lines from Megatron though.

"Optimus... How nice of you to show up... So predictable. The boy led me right to you, and I didn't even have to go out hunting"